When my DP-558 died i had no clue what the problem was and i wouldn't
have been able to figure it out myself until i found this topic.
woodstock & raffe gave a pretty good description of what to do.
Most likely only three Electrolytic capacitors of the secondary (low voltage)
area of your psu are defective.
Originally Posted by raffe
C15: 1000μF 16V 105°C Link
67-150-15 -----------> (was 1000μF 16V 105°C)
C19: 2200μF 16V 105°C Link
67-150-23 -----------> (was 2200μF 10V 105°C)
C20: 1000μF 16V 105°C Link
67-150-15 -----------> (was 1000μF 10V 105°C)
To replace them, and believe me its not that hard you need:
1. Phillips screwdriver (for the kiss case and the four psu screws)
2. solder gun (not more than 30w power) and of course a tiny bit of solder
3. i would highly recommend unsolder wire (absorbs the old solder like a sponge)
4. two capacitors 1000μF 16V 105°C (to replace C15 and C20)
5. one capacitor 2200μF 16V 105°C (to replace C19)
6. about 20-30 minutes of your precious time
I payed 1,33 Euro for the three capacitors and 2,95 for the unsolder wire.
I hope that helps.